US2277810A

US2277810A - Bearing seal

Info

Publication number: US2277810A
Application number: US312629A
Authority: US
Inventors: John F Zotter
Original assignee: Fafnir Bearing Co
Current assignee: Fafnir Bearing Co
Priority date: 1940-01-06
Filing date: 1940-01-06
Publication date: 1942-03-31
Anticipated expiration: 1959-03-31

Description

March 31, 1942. Y J zo 2,277,810

BEARING SEAL Filed Jam. 6,-1940 INVENTOR JOHN E 20775? ATTORN EYS Patented Mar. 31, 19 42 BEARING SEAL John F. Zotter, New Britain, Conn., assignor to The Falnir Bearing Company, New Britain, Conn., a corporation of Connecticut Application January 6, 1940, Serial No. 312,629

3 Claims.

My invention relates to an anti-friction bearing and more particularly to an improved form of bearing seal.

It is an object of the invention to provide a simple improved form of bearing seal relatively cheap to manufacture and highly eflicient in retaining lubricant in the bearings and excluding foreign matter therefrom.

Other objects and various features of novelty and invention will be hereinafter pointed out or will become apparent to those skilled in the art.

In the drawing which shows, for illustrative purposes only, a preferred form of the invention- Figure 1 is an edge view in quarter section of a bearing embodying the invention.

Fig. 2 is a partial edge view similar to that of Fig. 1, but illustrating another embodiment of the invention.

While the invention is not strictly limited to a bearing of the self-alining type, it is particularly advantageous when embodied in such a bearing, and the drawing shows the invention in connec- -tion with a self-alining bearing of more or less standard construction.

The bearing may include an inner ring 5, an outer ring 6, with interposed anti-friction bearing members, such as balls 7. One of the rings, in this case the outer, is provided with a spherically formed raceway 8, the center of the sphere being on the axis of the bearing, as will, be understood. Thus the balls 7, being carried in standard raceway grooves on the inner ring, will move therewith during self-alinement while the balls 'I. may slide or roll along the surface 8. Such bearings are now well known in the art.

My invention is particularly in the seal for securely sealing lubricant in the bearing and excluding foreign matter therefrom. The seal in its preferred form includes a sealing ring formed of oil resistant or impervious resilient material, such as artificial rubber. This real ring 9 is carried by one of the bearing rings, in this case the inner ring, as by being mounted on a rabbeted or grooved portion 9' in the outer surface. of the inner ring. The other ring, in this case the outer ring, carries acomplementary seal member, preferably in the form of a seal plate l0, formed of sheet metal or the like. The outer ring may have a counterbpre therein, providing a seat or abutment ll against which the outer portion of the seal plate l may abut, and an undercut groove 12, into which the outer edge of the seal plate Ill may be forced or swedged or otherwise held in suitable manner. Preferably the outer sealing surface l3 on the seal ring 9 is of generally spherical form and concentric with the spherical race surface 8. The inner I edge of the seal plate I0 is preferably flared outwardly, as indicated at l4, so as to provide a generally rounded smooth sealing surface on the plate In, which 'surface is in sealing contact with the outer surface I3 of the seal ring 9. The parts are preferably so proportioned that the contact surface M on the seal plate I0 deforms the surface I; of the ring 9 to some extent, so as to form a relatively tight seal against loss of lubricant and the ingress of foreign matter. The contact area is preferably relatively slight and the contact surfaces will be sufficiently lubricated bylubricant from the bearing, so as to avoid undue friction and to permit free rotation and selfalinement of the-bearing. The degree of selfalinement is preferably limited by the seal plate l0 and the inner bearing ring in that at the limit of self-alinement the inner edge of the seal plate It will contact with a part of the inner ring 5 in a manner as will be understood.

It will be seen that I have provided an improved form of seal which will effectively seal the bearing even against ingress of foreign matter, such as cleaning fluid forcibly sprayed onto the bearing, 'as when an airplane is cleaned by being hosed or sprayed down.

My improved seal is particularly, though not exclusively, adapted for bearings having relatively low rotation and particularly to a self-alining bearing in that within the limits of self-alinement the seal will be substantially equally effective.

While I prefer to employ a seal ring 9 of generally resilient rubber-like material, the seal ring 9 may be made of any suitable material, for example, metal, and be slightly shorter than the groove 9' or, in fact, simply slipped over a turneddown portion of the inner ring and there may be a resilient washer N5 of metal or other suitable material interposed between the radially extending edge of the seal ring 9 and the adjacent abutment surface l5 of the inner ring. In the form shown in Fig. 2 the resilient'washer I 6 is a metallic ring having flexing tongues l6. Thus a non-resilient annular ring I1 may be forced outwardly into sealing contact with the seal plate l0, as heretofore described. v

While the invention has been described in considerable detail and a preferred form illustrated,

, it is to be understood that various changes may 1. Seal means for a bearing including a pair of concentric rings one within the other and held in axially self-aligning relationship about a point on the axis of both rings, said seal means comprising an annulus of yielding resilient material secured to one of said rings and having a surface of substantially spherical form, said surface having its center of generation substantially at the point aforesaid on the axis of both said rings, and a seal plate secured at one edge to the other of said rings and extending across the space between said rings and at its other edge into stressing sealing contact with said substantially spherical surface on said annulus of yielding resilient material.

2. Seal means for a bearing including a pair of concentric rings one within the other and held in axially self-aligning relationship about a point on the axis of both rings, said seal means comprising an annulus of yielding resilient material secured to the inner of said rings and having a convex surface of substantially spherical form, said surface having its center of generation substantially at the point aforesaid on the axis of both said rings, and a seal plate secured at its outer edge to the outer or said rings and extending across the space between said rings and at its inner edge into stressing sealing contact with said substantially spherical surface on said annulus of yielding resilient material.

3. Seal means for a bearing including a pair of concentric rings one within the other and held in axially self-aligning relationship about a point on the axis of both rings, said seal means comprising a seal annulus movably mounted on one of said rings and having a surface of substantially spherical form, said surface having its center of generation substantially at the point aforesaid on the axis of both said rings, and a seal plate secured to the other of said rings and extending across the space between said rings and at its other edge into sealing contact with said substantially spherical surface, and spring means between said seal annulus and said ring carrying said annulus for constantly urging the latter into sealing contact with said seal plate.

JOHN F. ZOTTER.